Intel Xeon E3 1245 v5 's Advantages
Higher base frequency (3.5GHz vs 2.3GHz)
Lower TDP (80W vs 215W)
Xeon 6556P B 's Advantages
Released 9 years and 4 months late
Higher specification of memory (6400 vs 2133)
Newer PCIe version (5 vs 3)
Larger L3 cache size (144MB vs 8MB)
More modern manufacturing process (5nm vs 14nm)